Deepctr

Change Log
Major Features and Improvements
- Add [EDCN](https://deepctr-doc.readthedocs.io/en/latest/Features.html#edcn-enhancing-explicit-and-implicit-feature-interactions-dcn) model Heyi007
Bug Fixes and Other Changes
- fix typo in position encoding layer aceport
- fix savedmodel error in tf2.4 498 shenweichen


DisscussionGroup

- [Github Discussions](https://github.com/shenweichen/DeepCTR/discussions)
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Change Log
Major Features and Improvements
- Support Python 3.9 and 3.10 ArtificialZeng
- Support `cos` and `ln` attention_type in transformer layer shenweichen
Bug Fixes and Other Changes
- fix typo in transformer layer 490 494 DarryYoung BlackcOVER

Change Log
Major Features and Improvements
- Improve compatibility with tensorflow 2.x shenweichen
Bug Fixes and Other Changes


- fix running error in tensorflow version higher than 2.5 432 453 15pengyi


DisscussionGroup

- [Github Discussions](https://github.com/shenweichen/DeepCTR/discussions)
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Change Log
Major Features and Improvements
- add multitask learning models : [link](https://deepctr-doc.readthedocs.io/en/latest/Features.html#multitask-models) morningsky shenweichen
- SharedBottom
- ESMM(Entire Space Multi-task Model)
- MMOE(Multi-gate Mixture-of-Experts)
- PLE(Progressive Layered Extraction)
- add example of running multitask model in deepctr [link](https://deepctr-doc.readthedocs.io/en/latest/Examples.html#multitask-learning-mmoe)
Bug Fixes and Other Changes
fix truncated feature value error when padding string sequence in `run_multivalue_movielens_hash.py` 389 JiaweiCui

API changes
- set `dnn_hidden_units` parameter to `(256, 128, 64)`
- - add new package`deepctr.models.multitask`
- files of sequence model are moved from `deepctr.models` to `deepctr.models.sequence`
- `deepctr.models.din` to `deepctr.models.sequence.din`
- `deepctr.models.dien` to `deepctr.models.sequence.dien`
- `deepctr.models.dsin` to `deepctr.models.sequence.dsin`
- `deepctr.models.bst` to `deepctr.models.sequence.bst`

Change Log
Major Features and Improvements
- Support pre-defined key-value vocabulary in Hash Layer [example](https://github.com/shenweichen/DeepCTR/blob/master/examples/run_multivalue_movielens_vocab_hash.py) dengc367
Bug Fixes and Other Changes
- Make position encoding in transformer consistent with original paper 379 dengc367 chenxli

API changes

Add `vocabulary_path` parameter for `deepctr.feature_column.SparseFeat` [api doc](https://deepctr-doc.readthedocs.io/en/latest/Features.html#sparsefeat)

Change Log
Major Features and Improvements
- add [IFM](https://deepctr-doc.readthedocs.io/en/latest/Features.html#ifm-input-aware-factorization-machine) and [DIFM](https://deepctr-doc.readthedocs.io/en/latest/Features.html#difm-dual-input-aware-factorization-machine) model zanshuxun
- add [DeepFEFM](https://deepctr-doc.readthedocs.io/en/latest/Features.html#deepfefm-deep-field-embedded-factorization-machine) model pandeconscious
- improve the compatibility for tensorflow 2.5 shenweichen

Bug Fixes and Other Changes

- add training param to activation layer 360 shenweichen
- add PositionEncoding Layer 365 shenweichen
- fix error when linear_feature_columns is empty in tensorflow 1.12 shenweichen